Tunneling techniques such as IP-in-IP when deployed in the middle of
the network, typically between routers, have certain issues regarding
how large packets can be handled: whether such packets would be
fragmented and reassembled (and how), whether Path MTU Discovery
would be used, or how this scenario could be operationally avoided.
This memo justifies why this is a common, non-trivial problem, and
goes on to describe the different solutions and their characteristics
at some length.
Working Group Summary
This is an individual submission. It was not discussed in any working
group, but was discussed on the int-area mailing list. One negative
comment was that, while the document isn't necessarily bad, it doesn't
contain enough new and useful information to elevate it to RFC status.
There was some associated philisophical discussion about what
should/should not become an RFC.
This is an overview of current practice. Call for review was made to
the int-area list. This document was reviewed by Mark Townsley.